One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(9,11)(10,13)(12,14)(15,16)(17,18,22,20)(19,23,25,27)(21,24,30,28)(26,31,29,32)(33,34,38,41)(35,42,36,39)(37,45,46,40)(43,47,44,48)(2,3)(5,13)(7,9)(12,16)(17,19)(18,23)(20,27)(21,29)(22,25)(24,32)(26,30)(28,31)(33,34)(35,42)(36,39)(37,40)(38,41)(43,48)(44,47)(45,46) involution — undirected(4,11)(7,9)(12,16)(14,15)(19,25)(23,27)(26,29)(31,32)(33,35,38,36)(34,39,41,42)(37,43,46,44)(40,47,45,48)(1,3,6,2)(4,7,11,9)(5,10,13,8)(12,14,16,15)(17,20,22,18)(19,23,25,27)(21,28,30,24)(26,31,29,32)(33,34)(35,39)(36,42)(37,40)(38,41)(43,47)(44,48)(45,46)(1,4,6,11)(2,7,3,9)(5,12,13,16)(8,14,10,15)(17,19)(18,23)(20,27)(21,26)(22,25)(24,31)(28,32)(29,30)(33,36,38,35)(34,39,41,42)(37,44,46,43)(40,47,45,48)(1,5,6,13)(2,8,3,10)(4,12,11,16)(7,14,9,15)(17,21)(18,24)(19,26)(20,28)(22,30)(23,31)(25,29)(27,32)(33,37,38,46)(34,40,41,45)(35,43,36,44)(39,47,42,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.